Medela is a great pump. I agree that you should replace the tubing and small parts as well. The company will do that pretty cheaply and it is much safer. I sold our last pump on craigslist.org (an Ameda). I love craigslist.

The pump I got on CL was a 20 minute drive, but I got to test it out, meet the mom, and while I was standing there testing the pump she dug out a bunch of extra supplies; unopened storage bags, extra pieces still in packages, wipes, steam bags, etc.